/*
 *  Copyright 2013 National Institute of Advanced Industrial Science and Technology
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.sss.util;

import java.util.concurrent.atomic.AtomicInteger;

public class CountDownCallback implements Runnable {
  private AtomicInteger counter;
  private Runnable callback;

  public CountDownCallback(int n, Runnable callback) {
    this.counter  = new AtomicInteger(n);
    this.callback = callback;
  }

  @Override
  public void run() {
    if (counter.decrementAndGet() == 0) {
      callback.run();
    }
  }
}
